CN102045791A - Method and system for realizing circuit switched fallback (CSFB) service in EPS - Google Patents
Method and system for realizing circuit switched fallback (CSFB) service in EPS Download PDFInfo
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Abstract
The invention discloses a method and a system for realizing a circuit switched fallback (CSFB) service in an evolved packet system (EPS), which can reduce service access time. The method comprises the following steps that: after accessing an evolved packet switched (EPS) network, user equipment (UE) triggers the CSFB service and sends a circuit switched (CS) network service request which carries a CSFB instruction to a mobility management entity (MME) when executing the service of a CS network; after receiving the service request which carries the CSFB instruction and is sent by the UE, the MME instructs an evolved universal terrestrial radio access network (E-UTRAN) to switch the UE to the CS network; and the E-UTRAN initiates switching and switches the UE to the CS network through the MME and a mobile switching center (MSC) co-registered by the UE when the UE accesses the EPS network.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to the executive circuit exchange under EPS (grouping domain system of evolution) network insertion of a kind of terminal and fall the method and system of (Circuit Switched Fallback is called for short CSFB) after rise.
Background technology
In order to keep 3-G (Generation Three mobile communication system) standardization project (3rd Generation Partnership Project, abbreviate 3GPP as) in the strong competitiveness of moving communicating field, 3GPP is just endeavouring research at present to packet switched core network (Packet Switched Core, abbreviate PS Core as) and global system for mobile communications wireless access network (Universal Mobile Telecommunication System Radio Access Network, abbreviate UTRAN as) evolution, purpose is to make the PS Core (being called for short EPC) of evolution that higher transmission rate can be provided, shorter transmission delay, and support E-UTRAN (Evolved UTRAN, the UTRAN of evolution), GERAN (GSM EDGE radio access network, GSM EDGE wireless access network, wherein GSM is the abbreviation of Global System for Mobile communications, it is global system for mobile communications, EDGE is the abbreviation of Enhanced Data Rate for GSM Evolution, be the enhanced data rates for gsm evolution technology), UTRAN, mobile management between the access network of WLAN (Wireless Local Area Network, WLAN (wireless local area network)) and other non-3GPP.The mobile communication system of this evolution is called as the grouping domain system (Evolved Packet System abbreviates EPS as) of evolution.
The terminal that Fig. 1 shows prior art realizes the Organization Chart of the professional CS of falling after rise of CS network under the EPS network insertion, for being described as follows of each entity among Fig. 1:
Subscriber equipment 101 (UserEquipment is called for short UE);
The wireless access network of UTRAN 102:GSM/ universal mobile telecommunications system (Universal Mobile Telecommunications System is called for short UMTS) network provides circuit domain and packet domain wireless access resource;
E-UTRAN 103: the wireless access network of evolution, higher up-downgoing speed can be provided, lower transmission delay and reliable more wireless transmission, the network element that comprises among the E-UTRAN is eNodeB (Evolved NodeB, the Node B of evolution), the access for terminal provides Radio Resource;
SGSN 104 (SGSN:Serving GPRS Supporting Node) Serving GPRS Support Node;
Gateway 105 (Serving Gateway is called for short S-GW) is a user entity, is responsible for the user face data route and handles;
Mobility Management Entity 106 (Mobility Management Entity, be called for short MME), it is a chain of command entity, the server of interim storaging user data, be in charge of and store UE context (such as UE/ user ID, mobility management states, user security parameters etc.), for the user distributes temporary mark, when quartering at this tracing area or this network, is responsible for UE this user is carried out authentication;
Mobile switching centre 107 (Mobile Switching Center is called for short MSC), this MSC also can be the new functional entity MSC Server after the R4 stage reaches etc., unified in the present invention with the MSC/VLR representative, wherein VLR is the calling party location register;
Public switch telephone network 108 (Public Switched Telephone Network is called for short PSTN) refers to fixed telephone network here.
As UE during in the EPS network insertion, notice MME carries out combined registering, and inform the CSFB ability of supporting, MME replaces UE to initiate combined registering to MSC, MSC receives combined registering message, if user data of no use is obtained user data to user attaching location register (Home Location Register is called for short HLR).
The terminal in the prior art of showing Fig. 2 realizes that under the EPS network insertion rising of the professional CS of falling after rise of CS network exhale flow process.UE registers at MME and MSC at the EPS network, at this moment UE initiates the CS business, and UE sends to MME and strengthens business request information, carries the CSFB indication in the message, MME receives to strengthen and falls back to the UTRAN network by E-UTRAN notice UE after the business request information and carry out the CS business, may further comprise the steps:
Step 201, UE send to MME and strengthen service request, carry the CSFB indication in the message, and the CSFB indication is used to indicate the MME executive circuit reciprocal exchange of business to fall after rise;
Step 202, MME send notice CSFB message to E-UTRAN, carry the CSFB indication in the message, indication E-UTRAN, and UE need fall back to the UTRAN network;
Step 203, E-UTRAN may obtain measurement report to UE, and UE falls back to concrete sub-district according to the measurement report decision;
If there is data service in step 204 UE at the EPS network, E-UTRAN triggers the packet domain switching flow, and data service is switched to the UTRAN network, and the present invention does not do detailed description to this;
If there is not data service in step 205 UE at the EPS network, E-UTRAN notice UE carries out and falls after rise, switches to the UTRAN network;
Behind step 206, the handover success, UE sends business request information at the UTRAN network to the MSC that the service purpose inserts the sub-district;
If the above-mentioned MSC of step 207 is the MSC of UE at EPS network insertion combined registering, then MSC judges according to user's business datum, receives this service request, returns the service access response message to UE, follow-up existence encryption and authentication process, the present invention does not do detailed description to this;
If the described MSC of step 208 step 206 is not the MSC of UE at EPS network insertion combined registering, this MSC user data of no use, MSC returns the service access refuse information to UE, and notice UE initiates more new technological process of position;
Step 209, UE initiate position updating process again at UTRAN;
Step 210, MSC obtain authentication parameter to HLR;
Step 211, HLR return authentication parameter to MSC, and MSC receives that authentication parameter notice UE carries out authentication process;
Step 212, authentication success;
Step 213, MSC initiates position updating request to HLR;
Step 214, HLR notification source MSC delete user data;
Step 215, source MSC notice MME deletion incidence relation;
After step 216, the success of MME deletion user data, return the deletion success message to source MSC;
Step 217, source MSC return the deletion success message to HLR;
Step 218, HLR send to MSC and insert user data requests;
Step 219, MSC return the insertion success message to HLR after inserting the user data success;
Step 220, HLR upgrade response message to the MSC home position;
Step 221, MSC notice UTRAN carry out ciphering process;
Step 222, MSC upgrade response message to the UE home position;
Above-mentioned steps 208-222 is the MSC that falls after rise of UE with the MSC of combined registering just needs execution when not being same.
Step 223, UE make a call to set up to MSC and ask;
Step 224, MSC notice UTRAN set up land circuit and Radio Resource;
Step 225, MSC set up the interoffice carrying to PSTN.
Describe as step 203, E-UTRAN is according to the Target cell that the radio signal quality decision of the measurement report of UE falls after rise, can't guarantee that the MSC that Target cell that UE falls after rise is served is identical MSC with UE at the MSC of EPS network insertion combined registering.When the MSC that falls after rise as UE and the MSC of combined registering were inequality, UE makes a call needed the extra step 208-222 that increases, and prolongs professional turn-on time greatly.
Summary of the invention
The technical problem to be solved in the present invention provides the implementation method and the system of circuit switching fall-back business among a kind of EPS, can reduce the service access time.
For solving the problems of the technologies described above, the invention provides a kind of professional implementation method of the middle circuit switching fall-back (CSFB) of grouping domain system (EPS) of evolution, comprising:
After subscriber equipment (UE) inserts packet switching (EPS) network of evolution, when executive circuit exchange (CS) network professional, trigger the CSFB business, described UE carries the CSFB indication when Mobility Management Entity (MME) sends CS Network request;
After described MME received the service request of carrying the CSFB indication of described UE transmission, the global system for mobile communications Radio Access Network (E-UTRAN) of indication evolution switched to described CS network with described UE;
Described E-UTRAN initiates to switch, and the mobile switching centre (MSC) by described MME and described UE combined registering when inserting described EPS network switches to described CS network with described UE.
Further, described UE is switched to the CS network be meant the wireless access network that described UE is switched to the CS network, comprise global system for mobile communications Radio Access Network (UTRAN) or GSM
The EDGE wireless access network.
Further, described E-UTRAN initiates to switch, and the MSC by MME and described UE combined registering when inserting described EPS network further comprises the step that described UE switches to the CS network:
Described E-UTRAN selects the Target cell of switching, sends handoff request by described MME to the MSC of described UE combined registering, the Target cell of selecting to switch is notified to the MSC of described UE combined registering;
The MSC of described UE combined registering determines the wireless access network of CS network according to described Target cell, send handoff request to described wireless access network, indicating does not have the carrying switching, and described wireless access network is the switching distribution wireless signaling resource of described UE after receiving handoff request; Described wireless access network sends to described UE with the access parameter of described wireless signaling resource by described MSC, MME and E-UTRAN;
Described UE switches to the wireless access network of described CS network according to described access parameter.
Further, described E-UTRAN is according to the measurement report select target sub-district of UE.
Further, after described UE switches to the wireless access network of described CS network according to the access parameter of described wireless signaling resource, MSC by described UE combined registering triggers, and indicating described wireless access network is that UE distributes call bearer, comprises ground loading circuit and radio bearer resources.
Further, the MSC of described UE combined registering determines the wireless access network of CS network according to described Target cell, send handoff request to described wireless access network, indication does not have carrying and switches, described wireless access network is the step of the switching distribution wireless signaling resource of described UE after receiving handoff request, further comprises:
The MSC of described UE combined registering is if judge that described Target cell is not within this MSC compass of competency, then will administer the MSC of described Target cell as target MSC, determine the wireless access network of CS network by described target MSC, described target MSC sends handoff request to described wireless access network, indicating does not have the carrying switching, and described wireless access network is the switching distribution wireless signaling resource of described UE after receiving handoff request.
Further, after described UE switches to the wireless access network of described CS network according to the access parameter of described wireless signaling resource, MSC by described UE combined registering triggers, indicating described wireless access network by described target MSC is that UE distributes call bearer, comprises ground loading circuit and radio bearer resources.
Trigger the CSFB business when further, carrying out following CS Network: caller works the business of exhaling, called paging business, facsimile service, CS network video service.
For solving the problems of the technologies described above, the present invention also provides the middle circuit switching fall-back (CSFB) of a kind of grouping domain system (EPS) of evolution professional realization system, comprise: the global system for mobile communications Radio Access Network (E-UTRAN) of Mobility Management Entity (MME), evolution, and the mobile switching centre (MSC) of UE combined registering when inserting described EPS network, wherein:
Described MME is used for indicating described E-UTRAN that described UE is switched to described CS network after receiving the service request of carrying the CSFB indication that subscriber equipment (UE) sends;
Described E-UTRAN is used for initiate switching, and the MSC by described MME and described UE combined registering when inserting described EPS network switches to described CS network with described UE;
Described MSC is used to assist described E-UTRAN that described UE is switched to described CS network.
Further, described system also comprises the wireless access network of CS network, wherein:
Described E-UTRAN is further used for selecting the Target cell that switches, sends handoff request by described MME to the MSC of described UE combined registering, the Target cell of selecting to switch is notified to the MSC of described UE combined registering;
The MSC of described UE combined registering is further used for determining according to the Target cell of described E-UTRAN notice the wireless access network of CS network, sends handoff request to described wireless access network, and indication does not have carrying and switches;
It is the switching distribution wireless signaling resource of described UE that described wireless access network is used for after receiving described handoff request, and the access parameter of described wireless signaling resource sent to described UE by described MSC, MME and E-UTRAN, make described UE switch to the wireless access network of described CS network according to described access parameter.
Further, the MSC of described UE combined registering also is used for, and after UE switched to the wireless access network of described CS network according to described access parameter, indicating described wireless access network was that UE distributes call bearer, comprises ground loading circuit and radio bearer resources.
The present invention compared with prior art, provide a kind of circuit-switched service to fall implementation method after rise, when carrying out CSFB to avoid UE,, thereby cause prolonging the service access matter of time because of the MSC that falls after rise MSC different needs position renewal with combined registering by the mode of switching.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the network architecture diagram that realizes the CS business according to the terminal of prior art under the EPS network insertion;
Fig. 2 is that the terminal of prior art realizes that under the EPS network insertion CS business falls rising of CS network after rise and exhales flow chart;
Fig. 3 is the schematic flow sheet of the embodiment of the invention one;
Fig. 4 is the schematic flow sheet of the embodiment of the invention two;
Fig. 5 is the schematic flow sheet of the embodiment of the invention three;
Fig. 6 is the schematic flow sheet of the embodiment of the invention four.
Embodiment
Inventive concept of the present invention is: after UE inserts the EPS network, when carrying out CS network professional, trigger the CSFB business, described UE carries the CSFB indication when MME sends CS Network request; After described MME received the service request of carrying the CSFB indication of described UE transmission, indication E-UTRAN switched to described CS network with described UE; Described E-UTRAN initiates to switch, and the MSC by described MME and described UE combined registering when inserting described EPS network switches to described CS network with described UE.
Trigger the CSFB business when carrying out following CS Network: caller works the business of exhaling, called paging business, facsimile service, CS network video service.
Above-mentionedly described UE is switched to the CS network be meant the wireless access network that described UE is switched to the CS network, comprise UTRAN or GSM EDGE wireless access network.
Above-mentioned E-UTRAN initiates to switch, and the MSC by MME and described UE combined registering when inserting described EPS network further may further comprise the steps the step that described UE switches to the CS network:
(a) described E-UTRAN selects the Target cell of switching, sends handoff request by described MME to the MSC of described UE combined registering, the Target cell of selecting to switch is notified to the MSC of described UE combined registering;
Preferably, E-UTRAN can be according to the measurement report select target sub-district of UE.
(b) MSC of described UE combined registering determines the wireless access network of CS network according to described Target cell, send handoff request to described wireless access network, indicating does not have the carrying switching, and described wireless access network is the switching distribution wireless signaling resource of described UE after receiving handoff request; Described wireless access network sends to described UE with the access parameter of described wireless signaling resource by described MSC, MME and E-UTRAN;
(b) described UE switches to the wireless access network of described CS network according to described access parameter.
After UE switches to the wireless access network of described CS network according to the access parameter of described wireless signaling resource, triggered by the MSC of described UE combined registering, indicating described wireless access network is that UE distributes call bearer, comprises ground loading circuit and radio bearer resources.
When the MSC of UE combined registering judges that described Target cell is not within this MSC compass of competency, then will administer the MSC of described Target cell as target MSC, determine the wireless access network of CS network by target MSC, send handoff request by target MSC to wireless access network, indicating does not have the carrying switching, and wireless access network is the switching distribution wireless signaling resource of described UE after receiving handoff request.When distributing call bearer, by the MSC triggering of UE combined registering, indicating described wireless access network by described target MSC is that UE distributes call bearer.
Below in conjunction with drawings and Examples the present invention is described in further detail.
Embodiment one
Fig. 3 is the embodiment of target UTRAN network in the MSC of user's combined registering compass of competency.User terminal is in the EPS network-originated call, and MME notice E-UTRAN falls back to the UTRAN network to the user, and target UTRAN network may further comprise the steps in the MSC of user's combined registering compass of competency:
Step 301, UE are linked into the E-UTRAN network, and successful combined registering is to MSC, the user makes a call, UE finds that current network can't realize the call business of CS network, then by the E-UTRAN network, send the enhancing business request information to MME, carry the CSFB indication in the message, be used to notify MME that UE is switched to the CS network;
Step 302, MME indicate according to CSFB, send notice CSFB message to E-UTRAN, and indication E-UTRAN switches to the CS network to UE;
Step 303, E-UTRAN obtain measurement report;
For example, E-UTRAN can obtain the current wireless measurement report to UE, perhaps obtains the measurement report of the last time of self preserving.
Step 304, E-UTRAN are according to measurement report, the select target sub-district sends handoff request to MME, carries parameters such as CSFB indication, cell-of-origin sign and Target Cell Identifier in the message, exist data service to connect if the user is current, also carry the bearing identification that needs switching in the message;
In this step, no matter whether UE exists data service, E-UTRAN all can select a Target cell according to the content of measurement report.
E-UTRAN sends to MME to the relevant information of major general CSFB indication and Target cell.
Step 305, MME receive handoff request, if judging that the user is current exists data service, trigger the packet domain switching flow, and the present invention does not do detailed description to this, packet domain switch finish after execution in step 306;
There is not data service if the user is current, then direct execution in step 306.
Step 306, MME judge whether carry the CSFB indication in the handoff request, if carry, MME sends handoff request to the MSC of UE combined registering, carries user ID in the message, target cell information and CSFB indication;
Because MME stores user data, therefore MME can be known the MSC of UE combined registering, MME directly sends handoff request to the MSC of UE combined registering, participate in switching flow by this MSC, thereby avoided in the prior art because of the MSC of falling and the problem of the different service access time lengthening that cause of MSC of combined registering.
If do not have the CSFB indication in the handoff request, then handle according to existing procedure.
Step 307, MSC receive the MME handoff request, judge to carry the CSFB indication in the request message, and the business of carrying out according to the user judges whether to allow to carry out the CSFB business again, if allow, then execution in step 308, otherwise refusal switches;
The scene of present embodiment is " target UTRAN network is in the MSC of user's combined registering compass of competency ", and this is to determine by the judgement of the MSC in this step.After MSC receives the MME handoff request, after judgement allows to carry out the CSFB business, judge that also the indicated Target cell of the Target Cell Identifier that carries in the handoff request is whether within this MSC compass of competency, if, execution in step 308, if not, referring to the flow process of embodiment two.
Step 308, MSC are according to the Target cell in the handoff request message, select target UTRAN, send handoff request, indication does not have the carrying switching in the message, UTRAN receives handoff request, distribute the wireless signaling resource, return handover acknowledge message, carry the access parameter of the wireless signaling resource of having distributed in the message to MSC;
In the present invention, UE is in the not carrying of CS network, so MSC do not have carrying to target UTRAN indication and switch, and target UTRAN is that UE distributes wireless signaling resource, i.e. hand off signaling Dedicated Control Channel resource.
Step 309, MSC receive handover acknowledge message, give MME the handover acknowledge forwards;
Step 310, MME receive handover acknowledge message, send switching command by E-UTRAN to UE, and notice UE switches to target UTRAN network, carries the wireless signaling resource access parameter that has distributed in the switching command;
Step 311, UE switch to the wireless channel that UTRAN reserves according to UTRAN wireless signaling resource access parameter in the switching command, finish handover operation, and after finishing, UE is packaged into device message to call setup message, sends to MSC by the UTRAN network;
If other business still can send to MSC by call setup message, difference is the type of service difference.
Step 312, MSC receive the device message of target UTRAN network, unpack and obtain call setup message, and the customer call authority is judged, if allow customer call, MSC is encapsulated into call answering message in the device message, to UE dispensing device message;
Step 313-316, MSC send to UTRAN and assign bearer messages, and notice UTRAN is that UE distributes call bearer, comprises ground loading circuit and radio bearer resources, promptly wired carrying and radio bearer, and described radio bearer can be used for transmitting voice medium;
Step 317, MSC carry between foundation and far-end PSTN according to the called number in the 311 step call setup messages.
Embodiment two
Fig. 4 is the not embodiment in the MSC of user's combined registering compass of competency of target UTRAN network.User terminal is in the EPS network-originated call, and MME notice E-UTRAN falls back to the UTRAN network to the user, and target UTRAN network in the MSC of user's combined registering compass of competency, not may further comprise the steps:
The same 301-307 of step 401-407;
In the present embodiment, the MSC of UE combined registering is called source MSC, and MME sends handoff request to source MSC.
Step 408, source MSC are according to the Target cell in the handoff request message of receiving, select target MSC to target MSC transmission preparation handoff request mobile application part part (Mobile APplication Part is called for short MAP) message, indicates in the message not have to carry and switches;
The Target cell that described source MSC selects according to E-UTRAN is determined the target UTRAN under this Target cell, and the MSC that administers this target UTRAN is defined as target MSC.
Step 409, target MSC are according to the Target cell in the handoff request message, select target UTRAN, send handoff request, indication does not have the carrying switching in the message, UTRAN receives handoff request, distribute the wireless signaling resource, return handover acknowledge message, carry in the message and distribute wireless signaling resource access parameter to MSC;
Step 410, target MSC are received handover acknowledge message, return preparation handover acknowledge MAP message to source MSC, comprise the handover acknowledge message content of receiving in the message;
Step 411-412, source MSC return handover acknowledge message and give MME, and MME sends switching command by E-UTRAN to UE, carries wireless signaling resource access parameter in the switching command;
Step 413, UE switch to the wireless channel that UTRAN reserves according to UTRAN wireless signaling resource access parameter in the switching command, finish handover operation, send handoff completion message by UTRAN to target MSC;
Step 414, target MSC are informed MME to handoff completion message by source MSC;
Step 415-416, UE are packaged into device message to call setup message, send to target MSC by the UTRAN network, and after target MSC was received, the handle assembly message content was encapsulated in and passes to source MSC in the MAP message;
Carry called number in the call setup message.
Step 417, source MSC receive the MAP message of target MSC, unpack and obtain call setup message, and the customer call authority is judged, if allow customer call, MSC is encapsulated into call answering message in the MAP message, send MAP message to target MSC;
Step 418, target MSC are received MAP message, and content in the message is encapsulated in device message, pass to UE;
Step 419, source MSC send preparation handoff request MAP message to target MSC, carry in the message and distribute the carrying indication;
In the present embodiment, source MSC is that UE distributes call bearer by target MSC indicating target UTRAN.
Step 420-423, target MSC send to UTRAN and assign bearer messages, and notice UTRAN is that UE distributes ground bearer circuit and radio bearer resources;
Step 424, target MSC distribute Handover Number, send handover acknowledge MAP message to source MSC, carry Handover Number in the message;
Described Handover Number is used to set up the interoffice carrying between source MSC and the target MSC.
Step 425, source MSC carry between foundation and target MSC according to Handover Number;
After step 426, the carrying of source MSC Calling Side are set up and finished,, set up the carrying between far-end PSTN according to the called number in the 417 step call setup messages.
Embodiment three
Fig. 5 be target UTRAN network in the MSC of user's combined registering compass of competency, called embodiment.User terminal is received called paging (be user terminal as called receive paging) at the EPS network, user terminal sends to MME by E-UTRAN and strengthens service request, indication CSFB, MME notice E-UTRAN falls back to the UTRAN network to the user, target UTRAN network may further comprise the steps in the MSC of user's combined registering compass of competency:
Step 501, MSC receive far-end PSTN address initial request;
Step 502, MSC send the paging request by MME to UE;
After step 503, UE received the paging request, UE sent the enhancing business request information by the E-UTRAN network to MME, carries the CSFB indication in the message;
Step 504-512 is with step 302-310;
Step 513, UE switch to the wireless channel that UTRAN reserves according to UTRAN wireless signaling resource access parameter in the switching command, finish handover operation, send handoff completion message by UTRAN to MSC;
Step 514, UE send page reply message by device message to MSC at the UTRAN network;
Step is an optional step, and MSC also can go on foot 508 as the message that pages reply;
Step 515, MSC are encapsulated in call setup message in the device message, send to UE by the UTRAN network;
Step 516, UE are encapsulated in call answering message in the device message, give MSC by the UTRAN network delivery;
Step 517-520, MSC send to UTRAN and assign bearer messages, and notice UTRAN distributes ground bearer circuit and radio bearer resources;
Step 521, callee side carrying are set up and are finished, to far-end PSTN echo reply message, call establishment.
Embodiment four
Fig. 6 be target UTRAN network not in the MSC of user's combined registering compass of competency, called embodiment.User terminal is received called paging at the EPS network, user terminal sends to MME by E-UTRAN and strengthens service request, indication CSFB, and MME notice E-UTRAN falls back to the UTRAN network to the user, target UTRAN network in the MSC of user's combined registering compass of competency, not may further comprise the steps:
The same 501-509 of step 601-609;
Step 610, source MSC are according to the Target cell in the handoff request message of receiving, select target MSC to target MSC transmission preparation handoff request mobile application part part (Mobile Application Part is called for short MAP) message, indicates in the message not have to carry and switches;
Step 611, target MSC are according to the Target cell in the handoff request message, select target UTRAN, send handoff request, indication does not have the carrying switching in the message, UTRAN receives handoff request, distribute the wireless signaling resource, return handover acknowledge message, carry in the message and distribute wireless signaling resource access parameter to MSC;
Step 612, target MSC are received handover acknowledge message, return preparation handover acknowledge MAP message to source MSC, comprise the handover acknowledge message content of receiving in the message;
Step 613-614, source MSC return handover acknowledge message and give MME, and MME sends switching command by E-UTRAN to UE, carries wireless signaling resource access parameter in the switching command;
Step 615, UE switch to the wireless channel that UTRAN reserves according to UTRAN wireless access parameters in the switching command, finish handover operation, send handoff completion message by UTRAN to MSC;
Step 616, target MSC are informed MME to handoff completion message by source MSC;
Step 617-618, UE send page reply message by device message to target MSC at the UTRAN network, and after target MSC was received, the handle assembly message content was encapsulated in and passes to source MSC in the MAP message;
Step 617 and step 618 are optional steps, and MSC can be step 608 as the message that pages reply.
Step 619, source MSC are encapsulated into call setup message in the MAP message, send MAP message to target MSC;
Step 620, target MSC are received MAP message, and content in the message is encapsulated in device message, pass to UE;
Step 621-622, UE are encapsulated in call answering message in the device message, give target MSC by the UTRAN network delivery, and target MSC is received device message, and content in the message is encapsulated in MAP message, passes to source MSC;
Step 623, source MSC send preparation handoff request MAP message to target MSC, carry in the message and distribute the carrying indication;
Step 624-627, target MSC send to UTRAN and assign bearer messages, and notice UTRAN distributes ground bearer circuit and radio bearer resources;
Step 628, target MSC distribute Handover Number, send handover acknowledge MAP message to source MSC, carry Handover Number in the message;
Step 629, source MSC carry between foundation and target MSC according to Handover Number;
Step 630, callee side carrying are set up and are finished, to far-end PSTN echo reply message, call establishment.
The realization system for carrying out said process comprises: comprising: MME, E-UTRAN, and the MSC of UE combined registering when inserting described EPS network, wherein:
Described MME is used for indicating described E-UTRAN that described UE is switched to described CS network after receiving the service request of carrying the CSFB indication that UE sends;
Described E-UTRAN is used for initiate switching, and the MSC by described MME and described UE combined registering when inserting described EPS network switches to described CS network with described UE;
Described MSC is used to assist described E-UTRAN that described UE is switched to described CS network.
The MSC of described UE combined registering also is used for after UE switches to the wireless access network of described CS network according to described access parameter, and indicating described wireless access network is that UE distributes call bearer, comprises ground loading circuit and radio bearer resources.
Said system also comprises the wireless access network of CS network, wherein:
Described E-UTRAN is further used for selecting the Target cell that switches, sends handoff request by described MME to the MSC of described UE combined registering, the Target cell of selecting to switch is notified to the MSC of described UE combined registering;
The MSC of described UE combined registering is further used for determining according to the Target cell of described E-UTRAN notice the wireless access network of CS network, sends handoff request to described wireless access network, and indication does not have carrying and switches;
It is the switching distribution wireless signaling resource of described UE that described wireless access network is used for after receiving described handoff request, and the access parameter of described wireless signaling resource sent to described UE by described MSC, MME and E-UTRAN, make described UE switch to the wireless access network of described CS network according to described access parameter.
The foregoing description is that UTRAN is that example describes with the wireless access network of CS network only, and the wireless access network of described CS network also can be GERAN, and flow process is identical with UTRAN.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the professional implementation method of circuit switching fall-back (CSFB) in the grouping domain system of an evolution (EPS) comprises:
After subscriber equipment (UE) inserts packet switching (EPS) network of evolution, when executive circuit exchange (CS) network professional, trigger the CSFB business, described UE carries the CSFB indication when Mobility Management Entity (MME) sends CS Network request;
After described MME received the service request of carrying the CSFB indication of described UE transmission, the global system for mobile communications Radio Access Network (E-UTRAN) of indication evolution switched to described CS network with described UE;
Described E-UTRAN initiates to switch, and the mobile switching centre (MSC) by described MME and described UE combined registering when inserting described EPS network switches to described CS network with described UE.
2. the method for claim 1 is characterized in that,
Described UE is switched to the CS network be meant the wireless access network that described UE is switched to the CS network, comprise global system for mobile communications Radio Access Network (UTRAN) or GSM EDGE wireless access network.
3. the method for claim 1 is characterized in that, described E-UTRAN initiates to switch, and the MSC by MME and described UE combined registering when inserting described EPS network further comprises the step that described UE switches to the CS network:
Described E-UTRAN selects the Target cell of switching, sends handoff request by described MME to the MSC of described UE combined registering, the Target cell of selecting to switch is notified to the MSC of described UE combined registering;
The MSC of described UE combined registering determines the wireless access network of CS network according to described Target cell, send handoff request to described wireless access network, indicating does not have the carrying switching, and described wireless access network is the switching distribution wireless signaling resource of described UE after receiving handoff request; Described wireless access network sends to described UE with the access parameter of described wireless signaling resource by described MSC, MME and E-UTRAN;
Described UE switches to the wireless access network of described CS network according to described access parameter.
4. method as claimed in claim 3 is characterized in that,
Described E-UTRAN is according to the measurement report select target sub-district of UE.
5. method as claimed in claim 3 is characterized in that,
After described UE switches to the wireless access network of described CS network according to the access parameter of described wireless signaling resource, MSC by described UE combined registering triggers, indicating described wireless access network is that UE distributes call bearer, comprises ground loading circuit and radio bearer resources.
6. method as claimed in claim 3, it is characterized in that, the MSC of described UE combined registering determines the wireless access network of CS network according to described Target cell, send handoff request to described wireless access network, indication does not have carrying and switches, described wireless access network is the step of the switching distribution wireless signaling resource of described UE after receiving handoff request, further comprises:
The MSC of described UE combined registering is if judge that described Target cell is not within this MSC compass of competency, then will administer the MSC of described Target cell as target MSC, determine the wireless access network of CS network by described target MSC, described target MSC sends handoff request to described wireless access network, indicating does not have the carrying switching, and described wireless access network is the switching distribution wireless signaling resource of described UE after receiving handoff request.
7. method as claimed in claim 6 is characterized in that,
After described UE switches to the wireless access network of described CS network according to the access parameter of described wireless signaling resource, MSC by described UE combined registering triggers, indicating described wireless access network by described target MSC is that UE distributes call bearer, comprises ground loading circuit and radio bearer resources.
8. the method for claim 1 is characterized in that,
Trigger the CSFB business when carrying out following CS Network: caller works the business of exhaling, called paging business, facsimile service, CS network video service.
9. the professional realization system of circuit switching fall-back (CSFB) in the grouping domain system of an evolution (EPS), comprise: the global system for mobile communications Radio Access Network (E-UTRAN) of Mobility Management Entity (MME), evolution, and the mobile switching centre (MSC) of UE combined registering when inserting described EPS network, wherein:
Described MME is used for indicating described E-UTRAN that described UE is switched to described CS network after receiving the service request of carrying the CSFB indication that subscriber equipment (UE) sends;
Described E-UTRAN is used for initiate switching, and the MSC by described MME and described UE combined registering when inserting described EPS network switches to described CS network with described UE;
Described MSC is used to assist described E-UTRAN that described UE is switched to described CS network.
10. system as claimed in claim 9 is characterized in that described system also comprises the wireless access network of CS network, wherein:
Described E-UTRAN is further used for selecting the Target cell that switches, sends handoff request by described MME to the MSC of described UE combined registering, the Target cell of selecting to switch is notified to the MSC of described UE combined registering;
The MSC of described UE combined registering is further used for determining according to the Target cell of described E-UTRAN notice the wireless access network of CS network, sends handoff request to described wireless access network, and indication does not have carrying and switches;
It is the switching distribution wireless signaling resource of described UE that described wireless access network is used for after receiving described handoff request, and the access parameter of described wireless signaling resource sent to described UE by described MSC, MME and E-UTRAN, make described UE switch to the wireless access network of described CS network according to described access parameter.
11. as claim 9 or 10 described systems, it is characterized in that,
The MSC of described UE combined registering also is used for, and after UE switched to the wireless access network of described CS network according to described access parameter, indicating described wireless access network was that UE distributes call bearer, comprises ground loading circuit and radio bearer resources.
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| CN200910174829.2A CN102045791B (en) | 2009-10-17 | 2009-10-17 | Method and system for realizing circuit switched fallback (CSFB) service in EPS |
| PCT/CN2010/077585 WO2011044825A1 (en) | 2009-10-17 | 2010-10-08 | Method and system for enabling circuit switched fallback service in evolved packet system |
| US14/237,095 US9706444B2 (en) | 2009-10-17 | 2010-10-08 | Method and system for enabling circuit switched fallback service in evolved packet system |
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| CN200910174829.2A CN102045791B (en) | 2009-10-17 | 2009-10-17 | Method and system for realizing circuit switched fallback (CSFB) service in EPS |
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| US (1) | US9706444B2 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102045791B (en) | 2013-06-12 |
| US20140177599A1 (en) | 2014-06-26 |
| WO2011044825A1 (en) | 2011-04-21 |
| US9706444B2 (en) | 2017-07-11 |
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